parts of speech

P.joshi--your sentence lacks context and needs a modifier to give it meaning. For example: "I breathe air." If I just said this, it would not have context, but if I said "I breathe air to survive." The infinitive "to survive" gives context to your simple sentence. "She spends money." also lacks context. "She spends money because she has it." incorporates and adverb clause modifier to give context. Functionally, you have a sentence when you have a subject performing a verb. Jack pointed that out below.